BUG: unable to handle kernel paging request at 0000000100000000

[Raoul Bhatia]

I encountered an kernel oops running 3.11.0-7-generic #13-Ubuntu SMP Tue Sep 10 20:55:38 UTC 2013 x86_64 GNU/Linux under Debian Squeeze 6.0.7 amd64 on an Opteron barebone.

This server is an NFS client using cachefilesd.

The NFS server is Debian Squeeze 6.0.7 amd64 running 3.2.0-0.bpo.4-amd64 #1 SMP Debian 3.2.46-1~bpo60+1 x86_64 GNU/Linux and nfs-kernel-server on an Opteron barebone.

No kerberos is in use.

To get things up and running for 700+ user ids, i configured the following on the client, using trial and error, to have the correct user ids on the NFS mount:

echo N > /sys/module/nfs/parameters/nfs4_disable_idmapping
kernel.keys.root_maxbytes = 100000
kernel.keys.root_maxkeys = 1000
kernel.keys.maxbytes = 100000
kernel.keys.maxkeys = 1000

I was capturing the trace via an SSH session using tail -f so some information might be missing :-/ (attached)

Thanks,
Raoul

[Raoul Bhatia (raoul-bhatia)]

Please let me know if i should forward this to the kernel mailinglist instead!

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1225490

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Raoul Bhatia (raoul-bhatia)]

I'm running the Ubuntu kernel on Debian Squeeze where apport is not available.

However, i can report that kernel 3.2.0-0.bpo.4-amd64 3.2.46-1~bpo60+1 from Debian Squeeze Backports does not generate this issue. (The above settings are applied there too).

Might be related to Bug #1225494.

[Raoul Bhatia (raoul-bhatia)]

Another oops happened just now. Attaching the file.

Another reason for incomplete traces might also be that this host is running as a node in a pacemaker cluster where it is stonithed once it becomes unresponsive (STONITH happened at Sep 14 21:36:01 to 21:36:04 though)